Zur Theorie der Lichterzeugung und Lichtsabsorption; (withbound:) Das princip von der Erhaltung der Schwerpunktsbewegung und die Trägheit der Energie; (2 papers).

"The quantum theory has affected virtually every branch of physics. Its earliest and one of its most significant developments was Einstein's application of the theory to what is known as the 'photo-electrical effect'....Einstein explained this effext by suggesting that the classical view that light is emitted in the form of continous waves must be abandoned. The photo-electrical effect could be explained only as an example of quantum action where the waves of light or X-rays are emitted in minute particles or bullets. It is he size of the bullet (the wave-lenght of the radiation) which determines the number of electrons ejected. It was for this, and not for the theory of relativity, that Einstein was awarded the Nobel Prize in 1921. Einstein's two fundamental papers on this subject are "Ueber einem Erzeugung...." 1905 and Zur Theorie der Lichterzeugung (the paper offered here)" (PMM the note to 391). In the second paper (Principle of the conservation of the centre of mass motion and the inertia of energy) he shows that the conservation of mass is a special application of his energy principle (E= Mc2) - Weil: 12 & 13.
Among the many papers in this volume we have Max von Laue: Zur Thermodynamik der Inteferenzerscheinungen. pp. 365-378.